[Alt-photo] f stop and log values

Bob Cornelis bob at colorfolio.com
Fri May 26 18:05:03 UTC 2017

I have a 31 step stouffer step wedge and need to know what fraction to
increase/decrease exposure time when steps need to merge or separate.

I know each step is 1/3 of a stop but wasn't able to find the corresponding
fraction to adjust exposure. The Stouffer website has this info in the FAQ
section for the 21 step wedge only.

My math is not good enough to wade through all the equations on Wikipedia
to get the answer!




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